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natural Nutrition and reproduction nutrition interaction reproduction Humans have three life processes: nutrition, interaction and reproduction. Our digestive system esophagus mouth stomach intestine The mouth, the esophagus, the stomach and the intestine are part of our digestive system. The food pyramid Fish and meat Bread and cereals Fruit and vegetables Milk and dairy Fats and oils We need food from different groups everyday. Our respiratory system Nose Windpipe Lungs The nose, the windpipe and the lungs are part of our respiratory system. Our circulatory system Blood vessels Heart The heart and the blood vessels are part of our circulatory system. Our excretory system Our excretory system helps us get rid of waste products. Kidneys Ureters Bladder Urethra The kidneys, the ureters, the bladder and the urethra are part of our excretory system. Our excretory system helps us get rid of waste products. Human life cycle child baby elderly adult Our reproductive system uterus umbilical cord fetus vagina Our reproductive system allows us to have babies. The fetus grows inside the uterus.
